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Hectorite: Synthesis, modification, assembly and applications

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Hectorite: Synthesis, modification, assembly and applications

Abstract

Hectorite?(Na0.3Mg2.7Li0.3Si4O10(OH)2) is a trioctahedral?clay mineral?with peculiar?cation exchange capacity, surface reactivity and?adsorption, and easy?delaminationin water into individual?nanolayers, which can then re-assemble in various ways. The aqueous dispersion of hectorite exhibits exclusive rheological and?thixotropicproperties. The?paper reviews?recent progress in the synthesis, modification, assembly and applications of hectorite. The?present methods?for synthesizing hectorite are?hydrothermal synthesis, melt synthesis and structure-directed synthesis. Modification of hectorite can be made by?ion exchange,?intercalation, pillaring and?grafting. Layer-by-layer assembly,?template?assembly and hierarchical assembly have been used to formed a variety of hectorite-containing?hybrids?and?nanocomposites?such as films, membranes, capsules and?Janus?nanoparticles. Hectorite and hectorite-derived materials can be used as?adsorbents,?catalysts, fluorescent reporters,?hydrogels, and?biomaterials. Literature survey has indicated that hectorite has been successfully used as rheological and?thixotropic materials, and are being developed to be used in battery, fluorescent reporters, drug vehicles and?tissue engineering.



Highlights

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Insights into synthesis, modification, assembly and applications of hectorite.

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Hydrothermal synthesis, melt synthesis and structure-directed synthesis to synthetic hectorite.

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Modification of hectorite by ion exchange, intercalation, grafting and pillaring.

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Assembly of hectorite to form functional hybrids and hierarchical materials.

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Emerging applications in?adsorption, catalysis, biosensors, and medical materials.


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